Since eMBB tolerates delays, eMBB users can rely on long error-correction codes in combination with re-transmission techniques to compensate for the loss incurred by superposition/puncturing. Retransmission-based puncturing slows the eMBB traffic, and it requires more overhead including puncturing indicator (PI) to inform the eMBB user of the punctured resources, while the whole information block can be re-transmitted if decoding errors occur. Therefore, researchers have been thinking about using codes (code-based puncturing) to correct the erroneous symbols in the eMBB message and hence avoiding retransmissions and high overhead signal[1]}, [2]}. Particularly, the gain achieved by retransmission based puncturing over code-based puncturing is moderate and less than 10% [1]}, [2]}. Moreover, indicator-free scheme including a transmit precoding with blind detection is proposed for resource overhead reduction [5]}. In general, the more punctured eMBB symbols there are, the higher the number of erroneous eMBB symbols and the lower the code rate ( of the error correction code) we get, which subsequently results in low spectral efficiency. In this paper, we aim to reduce the number of contaminated eMBB symbols for the uncoded system and hence the possibility to enhance the code rate ( of the error correction code) of the eMBB and then the spectral efficiency.
